Apparatus for forming patterns for hollow cast ware.



Patented June 15, 1909.

J. H. DANVER a W. H. LOSE. APPARATUS TOR TORMING PATTERNS TOR HOLLOW GAST WARE. APPLICATION FILED DEU. 24, 1908.

rn: Namws PETERS ca., wAsmNgroN, a. c.

uNrTnn sirenas PATENT OFFICE.

JAMES H. DANVER, OF BEAVER, AND WILLIAM'H. LOSE, OF ZELIENOPLE, PENNSYLVANIA.

APPARATUS FOR FORI/IIN G PATTERNS FOR HOLLOW CAST WARE.

To all whom 'it may concern:

Be it known that we, JAMES H. EANVER and VILLIAM H. LOSE, residents ot Beaver and Zelienople, respectively, in the counties ol' Beaver and Butler, respectively, and State of Pennsylvania, have invented a new and useful improvement in Apparatus i'or Forni- .ing Patterns for l-lollow Cast ih/lare; and we do hereby declare the following to be a full, clear, and exact description thereof.

Our invention relates to patterns, and has special reference to the formation of patterns for molds in the casting of hollow ware such as bath-tubs, sinks, etc.

Heretotore in the casting ot hollow ware such as bath-tubs it has been customary to t'orm a sand mold for this casting in the following manner. The pattern for the casting is laid upon a Ailat board with the outside ol said pattern exposed, then one-half oll the tlask, which we will call the cope Vflask is laid over the pattern and the space between said pattern and ilask is filled and rammed with sand, so that said flask and sand will formV the cope half of the mold. This cope half and pattern are then turned over and the other half ol the Vflask called the drag is placed on top of the cope haltl oi the ilask and kept in position by pins attached to it, and acorresponding eye-bolt fastens the other halt oi the flask. The inner` or hollow part oi th pattern and drag 'iiask is then 'filled and rammed. with san d and then a bottom board is placed upon and clamped to said flask, after which thus completed mold is turned over, which leaves the bottom board securely on the door. The copeilask is then liited oit' the pattern and the pattern is then drawotll the sand contained in the hollow part of the pattern, so that by then placing the cope halt of the Aliask back onto the drag half oi the inold we have the completed mold ready tor pouring and with a mold cavity in the sand and between the two of the exact shape and thickness ot the pattern. This is the oldest method and most extensively used in the manufacture oi all castings ot this thickness to such an extent that about Q0 per cent. of all suoli castings are made by this process at the present time.` In order to improve the making of these castings there have been used what is known as pattern blocks, and the general principle oi these blocks with their apparatus tor drawing them is to have two blocks or patterns, one upon which they form the drag half of the sand mold and the Specification o Letters Patent.

Application led December 24, 1908.

Patented. .Tune 15, 1909.

Serial No. 469,158.

other the cope half. In these two blocks it is necessary to have one larger than the other in exactly the proportion et the thickness required in the castings ina-de from them and the method of making these two pattern yblocks by those employing this system of molding is as follows-An ordinary pattern is taken which is of the same thickness as the casting required from it and about l to 1 l/ in thickness is added to the outside of said pattern, and then a casting is made trom this pattern which gives a pattern block of about 1 1/2 to 1 S/lt in thickness all over, thereby forming the drag pattern block. To make the cope pattern block about i l/Lt to 1 1/2 thickness is added to the saine ordinary pattern on the inside or hollow part andy then a casting is made from this, so that these two pat-tern blocks are ground and tiled the same as an ordinary pattern, with the exception that the drag block is only finished on the inside and the cope block only on the outside. It will thus be `seen that in order to getthese two blocks to correspond in shape and size with only a difference ot thickness of 3/16 all over for the thickness of the casting to be formed means that it will require the best of mechanics and constant use of calipers, ten'iplets and gages to bring these blocks to finished state.

The making of the cope block which is iinished and iiled on the outside is a very simple matter, but when it comes to getting the drag block to correspond in thickness to said cope block, trouble is encountered on account oll the finishing being on the inside of the saine, so that as all such castings are very thin in comparison with the size, it will be seen that the getting ci' these blocks to make an exact thickness is the most important of the work,

The object ol' our invention is to overcome the objections and ditliculties found heretotore in making these patterns,- to do away with the great expense, time and skill in theV proper and accurate iinishing of the saine, and to provide patterns lor this work which will be cheap, vsimple and ei'licient in their construction, will overcome the making o'l' Varying thickness of this ware through the shrinkage in the casting oi the patterns, and will enable the casting of hollow ware, such as bath-tubs having the same even thickness oll walls throughout and oi the size desired.

Our invention consists, in the patterns as Fig. 1.

w or inner mold wall.

hereinafter more specifically set forth and described and particularly pointed out in the claims.

To enable others skilled in the art to which our invention appertains to construct and use our improved patterns, we will describe the same more fully, referring to the accompanying drawing, in which- Figure 1 is a plan view of' the hollow member for forming part of the drag pattern block. Fig. 1a is a like view of the hollow pattern member for forming the outer wall of the cope pattern block. Fig. 2 is a longitudinal section of the drag member shown in Fig. 2a is a like view of the pattern member shown in Fig. 1 a. Fig. 3 is a longitudinal section of' the drag pattern block. Fig. 3a is a like view showing the drag pattern block in position for forming the cope pattern block. Fig. 3" is a like view showing the pattern in position on the cope pattern block for forming the outer wall of the mold. Fig. 4 is a longitudinal section of the drag pattern block in position for forming the core Figs. 5 and 6 are sectional views showing other forms of the patterns. Fig. 7 is a detail View of a portion of one of the sections shown in Fig. 6.

Like symbols of reference herein indicate like parts in each of the figures of the drawmg.

tAs illustrated in the drawing, 1 represents the hollow member, which is preferably formed of cast metal and finished on its interior surface by filing or in any suitable manner so that it is even and smooth. This member 1 conforms to the exact shape and size of the finished article to be formed and it forms part of the drag pattern block a shown in Fig. 3, by being provided with a frame or casing 3 extending around the same and supported by its flange 4 on the rim 2 of said member, so that any suitable composition 5 can be placed within the space formed f between said member and casing and such member and casing be tied together by the stay rods 6 therein. After the drag pattern block a has been so formed, it is placed upon a cope machine for forming the cope pattern block t shown in Fig. 3L and Fig. 3b, such block a being suitably centered by means of a stripping plate 8 set upon the dowel pins 9 on the flask 7 and within which has been previously placed a frame or casing 10. A suitable composition 11 is then placed within the space formed between the pattern block a, flask 7 and casing 10, and such composition supported by the stay rods 12. After this is done the drag pattern block a and stripping plate 8 are removed, which leaves a molded form whose surfaces conform exactly to the contour of the molding face on the member 1 of the drag pattern block a. The molded face of this form is then covered with the sec* tions 13 formed from a hollow pattern member 14, such as is shown in Figs. 1a and 2, which can be formed of cast or sheet metal and finished to the thickness required in the article to be cast, and then such sections are placed upon and built up around the compo sition 11 of the molded form, as shown in Fig. 3b, where they are finally and firmly secured to said form and together in any suit able manner at their joints by any suitable filling material to complete the cope pattern t.

The drag pattern block a and plate 8 are placed upon a drag flask 15 on a mold board 15 such as is shown in Fig. 4 where they are held in their proper positions by the dowel pins 16 on said fiask passing through the said plate, so that the lower portion 17 and core portion 17 of the drag mold 18 can be formed by sand placed within the space between said block, plate, flask and board, and after this is done the block a can be removed from the said drag mold so formed on said fiask. lines Fig. 3b is placed on the flask 7 and around the cope pattern block Z) and such flask held in place and in proper position by the dowel pins 9 on the flask 7 passing through the flange 20 on the flask 19, so that sand can be placed in the space formed between the block and. flask 19 and the cope mold 21 shown in dotted lines in said figure formed thereby. After the drag mold 1S and cope mold 21 have been thus formed they are connected together in the usual manner for the casting of the article and the pouring operation performed to form such article.

1n order to insure the forming of the mold cavity of the exact thickness throughout for the even thickness of the tub metal throughout, a series of holes 22 can be drilled in the sections 13 of the cope member 14, as shown in Figs. 1a and 2a for the purpose of testing the thickness of the said member, and then such holes can be afterward filled up with Babbitt metal or other suitable material, as shown at 23 in Fig. 2a in order to form the completed solid member when in use, or these holes may be used in fastening the said sections upon the molded form to complete the pattern b shown in Fig. 3b.

As shown in Fig. 5, the hollow built-up pattern member 14 can be formed by using a rim portion 24 preferably of cast metal, such as brass, and of the proper shape and thickness for the rim of said pattern on the cope pattern block Z), which portion is joined to a soft metal portion 25, such as lead, extending around the composition 11 on said block and of the proper thickness, and such portion is provided with a sectional sheet metal portion 26, such as brass, for fitting The cope fiask 19, shown in dotted over the same and joined to said rim portion 24 to form the finished or completed pattern block l).

As shown in Fig. 6 the pattern member 14 can be formed by joining the sheet metal sections 13 together and to the cast rim portion 24 in any suitable manner, and such sections can be provided with holes or slots 14 therein for being connected to the composition 11 of the cope pattern block l) by any suitable Yfilling material, such as cement placed therein.

Various other modifications and changes in our improved means of forming patterns may be resorted to without departing from the spirit of the invention or sacrificing any of its advantages.

lt will thus be seen that our improved means of formingl patterns will enable such patterns to be formed in a rapid and convenient manner and the castings produced thereby will be free from any imperfections or uncvenness, while the cope pattern being similar in size and shape to the drag pattern and 'finished to the required thickness of casting and then made into sections for being built upon the cope block so as to conform to the shape of the cope pattern, will overcome the difference in shrinkage that would occur in a pattern cast in one piece. rlhe cope pattern block being also formed from the drag pattern block will enable the cope block to conform to said drag block, so that when the sectional cope member is placed on the cope block the exact and even thickness of casting will be formed when the drag and cope molds formed from the drag and cope pattern blocks respectively are placed together for the casting operation.

What we claim as our invention and desire to secure by Letters Patent, is-

1. ln patterns for hollow cast ware, the combination of a drag pattern block having a hollow pattern member, a cope pattern block contoured from said member, and a sectional pattern member on said cope block.

2. ln patterns for hollow cast ware, the combination of a drag pattern block having a hollow pattern member, a cope pattern block contoured from said member, and a sectional built-up pattern member on said cope block.

3. in patterns for hollow cast ware, the combination of a hollow pattern member, and a backing for said member secured thereto to form a pattern block.

4. ln a drag pattern for hollow cast ware, the combination of a hollow pattern member,

and a backing for said member secured thereto to form a drag pattern block.

5. In a cope pattern for hollow cast ware, the combination of a form, and a sectional pattern member of the size and thickness of the drag pattern member secured on said form to form a cope pattern block.

6. In a cope pattern for hollow cast ware, the combination of a form, and a sectional built-up pattern member of the size and thickness of the drag pattern member secured on said form to form a cope pattern block.

7. As a new article of manufacture7 a pattern block for hollow cast ware formed of a hollow member having a molded backing secured around the same.

8. As a new article of manufacture, a pattern block for hollow cast ware formed of a hollow )attern member having an incased molded acking secured around the same.

9. As a new article of manufacture, a cope pattern block for hollow cast ware having a built-up pattern member thereon.

10. As a new article of manufacture, a cope pattern block for hollow cast ware having a molded form provided with a built-up pattern member thereon.

11. As a new article of manufacture, a cope pattern block for hollow cast ware having an incased molded form around the same and a built-up pattern member on said form.

12. As a new article of manufacture, a cope pattern block for hollow cast waie having a pattern member formed of connected sections.

13. As a new article of manufacture, a cope pattern block for hollow cast ware having a form and a pattern member on said form and formed of connected sections.

14. As a new article of manufacture, a cope pattern block for hollow cast ware having a molded form and a pattern member on said form and formed of connected sections.

15. As a new article of manufacture, a cope pattern block for hollow cast ware having an incased molded form around the same and a pattern member formed of connected sections on said form.

ln testimony whereof, we, the said JAMns H. DANVER and i/VILLrAM H. Losn, have hereunto set our hands.

JAMES H. DANVER. VflLLlAM H. LOSE. Witnesses J. L. TREFALLEN, Jr., J. N. COOKE. 

